<!DOCTYPE html>
<html>
<head>
    <title>课堂互动系统</title>
    <link rel="stylesheet" href="/css/style.css">
</head>
<body>
    <h1>请选择访问模式：</h1>
    <div class="mode-select">
        <a href="/teacher.html" class="btn teacher-mode">教师端</a>
        <a href="/student.html" class="btn student-mode">学生端</a>
    </div>
    <script src="/js/common.js"></script>
</body>
</html>